Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Jul. 30, 2017	Jul. 31, 2016	Aug. 02, 2015
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Foreign currency translation adjustments, before tax		$ 40	$ 45	$ (312)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Unrealized gains (losses) arising during period, before Tax		19	(45)	(5)
Reclassification adjustment for (gains) losses included in net earnings, before tax		11	(9)	(1)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Prior service credit arising during the period, before tax		12	93	0
Reclassification of prior service credit included in net earnings, before tax	[1]	(25)	(1)	(2)
Other comprehensive income (loss), before tax		57	83	(320)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Foreign currency translation adjustments, tax (expense) benefit		0	0	1
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Unrealized gains (losses) arising during the period, tax (expense) benefit		(7)	16	3
Reclassification adjustment for (gains) losses included in net earnings, tax (expense) benefit		(4)	2	1
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax [Abstract]
Prior service credit arising during the period, tax		(4)	(34)	0
Reclassification of prior service credit included in net earnings, tax (expense) benefit		9	0	1
Other comprehensive income (loss), tax (expense) benefit		(6)	(16)	6
Other comprehensive income (loss), after-tax [Abstract]
Net earnings		887	563	666
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Foreign currency translation adjustments, after-tax		40	45	(311)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Unrealized gains (losses) arising during the period, after-tax		12	(29)	(2)
Reclassification adjustment for (gains) losses included in net earnings, after-tax		7	(7)	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Prior service credit arising during the period, net of tax		8	59	0
Reclassification of prior service credit included in net earnings, after-tax		(16)	(1)	(1)
Other comprehensive income (loss), after tax		51	67	(314)
Total comprehensive income (loss), after-tax		938	630	352
Total comprehensive income (loss) attributable to noncontrolling interests		0	3	(1)
Total comprehensive income (loss) attributable to Campbell Soup Company		$ 938	$ 627	$ 353

[1] This is included in the components of net periodic benefit costs (see Note 10 for additional details)